COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

The type of rotary compressor used in aeroplanes, is of

Radial flow type

Centrifugal type

None of these

Axial flow type

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For minimum work in multistage compression, assuming same index of compression in all stages

Work done in subsequent stages should increase

Work done in first stage should be more

Work done in subsequent stages should decrease

Work done in all stages should be equal

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In a jet propulsion

The propulsive matter is ejected from within the propelled body

Its functioning does not depend upon presence of air

The propulsive matter is caused to flow around the propelled body

None of these

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Standard air is the air at ___ and relative humidity of 36 percent.

0.1 bar and 40°C

1 bar and 20°C

1 bar and 40°C

0.1 bar and 20°C

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The thermodynamic efficiency of rotary compressor is based on

Polytropic compression

Isothermal compression

Isentropic compression

Adiabatic compression

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Gas turbine works on

Carnot cycle

Ericsson cycle

Brayton or Atkinson cycle

Rankine cycle

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Only rocket engines can be propelled to space because

They can generate very high thrust

They are not air breathing engines

They have high propulsion efficiency

These engines can work on several fuels

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The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.001

0.005

0.01

0.05

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The maximum combustion pressure in gas turbine as compared to I.C. engine is

More

Depends on other factors

Same

Less

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Ram compression in turbojet involves

Lost work

Reduction of speed of incoming air and conversion of part of it into pressure energy

Compression of inlet air

Increasing speed of incoming air

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